Clamping apparatus for press brake

Details Clamping apparatus for press brake Clamping apparatus for press brake

1991-02-27

1991-11-19

Jones, David

Metal deforming

Tool and/or tool holder

72481, B21D 3704

Patent

active

050656104

ABSTRACT:
An upper portion (3a) of an upper-die (3) is fixedly secured to a lower portion (2) of a ram (1) extending horizontally by way of a first clamping member (5) and a second clamping member (6) therebetween from both the fore side and the back side. The second clamping means (6) comprises a plurality of press plates (8)(8) arranged side by side in the horizontal direction. An opperating oil chamber (20) of a hydraulic cylinder (19) provided in each press plate (8) is connected in communication to a pressurized oil outlet port (42) and to a pressurized oil inlet port (41) both of which are opened in laterally opposed end surfaces (8b)(8a) of the press plate (8) respectively. The pressurized oil outlet port (42) and the pressurized oil inlet port (41) facing each other of the adjacent press plates (8)( 8) are connected in communication to each other by means of an interconnection pipe ( 23).

REFERENCES:
patent: 4506538 (1985-03-01), Jones, Jr.
patent: 4787237 (1988-11-01), Houston et al.
patent: 4895014 (1990-01-01), Houston

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